>>9829847various reasons, some old age, some were killed all the typical ways people die
this isnt a ships crew that died then came back and continued fucking around on that ship
my autistic lore is that on some planet for some reason skeletons started to rise with the ability to raise other skeletons, now these skeletons go around the universe collecting more and more skeletons, they dont need to eat, drink or sleep, they arent interested in human/alien conflicts, they arnt interested in conquest, they just fly around doing whatever they please and mapping the universe, when they find bodies or skeletons they take them, once a ship is full they will find a spot to stop and build more ships and crew them with collected skeletons, then those ships will go off on their own mapping and collecting missions, the purple suits are pilots and man the equipment for mapping, the orange suits are the engineers and builders, the guys with the guns (pic related) are tasked with the acquisition and preparation of new skellys, the green stuff in their weapons melts all biological material except for bones, once they are left with clean white bones they get risen, the plain skellys are just general guys ready to fill a role that needs filling
this concludes my ted talk